Evaluating Summer Flounder Spatial Sex-Segregation in a Southern New England Estuary

Evaluating Summer Flounder Spatial Sex-Segregation in a Southern New England Estuary
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评估新英格兰河口南部夏季比目鱼的空间性别隔离

DOI:
10.1002/mcf2.10065
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发表时间:
2019
影响因子:
1.7
通讯作者:
Collie, Jeremy S.
Collie, Jeremy S.
中科院分区:
农林科学3区
文献类型:
--
作者:
Langan, Joseph A.;McManus, M. Conor;Schonfeld, Adena J.;Truesdale, Corinne L.;Collie, Jeremy S.

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海洋鱼类物种在其生物特征上可能表现出性别差异。在种群评估或物种管理中不考虑这些特征可能会导致误解其种群动态,并导致无效的管理策略。夏季比目鱼Paralichthys Dentatus是一种比目鱼,支持美国东北部大陆架的重要商业和休闲渔业,它在几个特征上表现出性别之间的差异,包括生长和栖息地偏好。为了进一步了解这些模式,2016年和2017年,从罗德岛州水域进行的独立于渔业的调查中,收集了1302条夏季比目鱼并进行了性别鉴定。雌性比目鱼在所有月份都更多地出现在浅水(≤15米),但从5月到9月,雄性比目鱼更多地出现在更深的水域(>15米)。用广义线性模型和代表深度、温度、月份、年份和TL的协变量来评估收集到的比目鱼是雌性的概率。夏季比目鱼更有可能是雌性,体型较大,生活在较浅的水域,并在季节后期。与休闲渔业在抽样期间的上岸数据相比较,结果表明,在该领域捕捞的几乎所有比目鱼都是雌性。这项工作为夏季比目鱼的性别隔离提供了进一步的证据和特征,并强调了为了管理目的,除了更广泛的分布模式外,考虑细尺度空间动态的重要性。拟合的模型是朝着了解综合捕捞努力对不成比例地捕捞雄性或雌性比目鱼的影响,以及探索由此对区域产卵种群生物量和种群复原力的影响迈出的有效的第一步。
Marine fish species can exhibit sex‐specific differences in their biological traits. Not accounting for these characteristics in the stock assessment or management of a species can lead to misunderstanding its population dynamics and result in ineffective regulatory strategies. Summer FlounderParalichthys dentatus, a flatfish that supports significant commercial and recreational fisheries along the northeastern U.S. shelf, expresses variation in several traits between the sexes, including growth and habitat preference. To further understand these patterns, 1,302 Summer Flounder were collected and sexed in 2016 and 2017 from fisheries‐independent surveys conducted in Rhode Island state waters. Female flounder were more prevalent in shallow waters (≤15 m) through all months, but males had a greater presence in deeper waters (>15 m) from May through September. The probability of a collected flounder being female was evaluated with generalized linear models and covariates representing depth, temperature, month, year, and TL. Summer Flounder were more likely to be female at larger sizes, in shallower waters, and late in the season. When compared with landings data in the recreational fishery over the sampling period, the results suggest that nearly all flounder harvested in the sector were female. This work provides further evidence for and characterization of Summer Flounder sex‐segregation and highlights, for management purposes, the importance of considering fine‐scale spatial dynamics in addition to broader distribution patterns. The fitted model represents an effective first step toward understanding the implications of an aggregated fishing effort for disproportionate removals of male or female flounder and for exploring resulting consequences for regional spawning stock biomass and stock resiliency.
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